Strong brine evaporating and crystallizing system

Abstract

The invention provides a strong brine evaporating and crystallizing system, which comprises a calcium-magnesium removing reaction tank, a filter press, a feeding tank, a crystallizing separator, a crystallizing heater, a compressor, a thickener, a centrifugal machine and a mother liquor tank, wherein the filter press is connected with the calcium-magnesium removing reaction tank, and the feeding tank is connected with the filter press; the crystallizing separator is connected with the feeding tank, a strong brine inlet and a strong brine outlet of the crystallizing heater are respectively connected with the crystallizing separator; an inlet and an outlet of the compressor are respectively connected with the crystallizing separator and the crystallizing heater; an inlet of the thickener is connected with the crystallizing separator, an outlet of the thickener is connected with the centrifugal machine, and a liquid outlet of the centrifugal machine is connected with the crystallizing separator through the mother liquor tank. The strong brine evaporating and crystallizing system can be used for processing mixed strong brine with TDS (total dissolved solids) concentration of 100-300g / L so as to realize continuous stable running and total recycling of the sewage, solves the problem of water resource shortage in some areas and reduces pollution to the environment.

Description

technical field [0001] The invention relates to the technical field of environmental protection, and more particularly, to a concentrated brine evaporation and crystallization system. Background technique [0002] At present, the treatment of concentrated brine at home and abroad generally adopts the natural evaporation of evaporation ponds or the use of evaporation crystallization systems to crystallize solid salts into safe landfills. [0003] Evaporation pond natural evaporation is a large-area pond, which stores concentrated brine, and uses solar energy to evaporate water naturally, so that the salt remains at the bottom of the pond for regular cleaning. At the same time, the evaporation pond needs to adopt corresponding anti-seepage measures. [0004] The use of evaporation ponds is energy-saving and has low operating costs, but its equipment has large capacity, large floor space, high requirements for anti-leakage, low evaporation rate, high one-time investment, inabil...

AI Technical Summary

Problems solved by technology

[0008] If the concentrated brine contains calcium ions, magnesium ions, sulfate ions, carbonate ions, silicates, etc., they will be continuously concentrated to co-saturation during the evaporation crystallization process to produce crystal nuclei such as calcium sulfate, calcium carbonate, and silicate colloids. , the crystal nuclei and colloids adhere to the surface of the heat exchange tubes of the crystallization separator and crystallization heater to form a scale layer, which affects the heat transfer effect

[0009] In the process of evaporation and crystallization of concentrated brine, it is easy to produce secondary steam mist entrainment phenomenon, and the salt water droplets carried in the mist adhere to the wire mesh or baffle plate of the demister, and continuously concentrate and precipitate crystals to form a scale layer, seriously When the secondary steam is blocked, it will affect the continuous and stable operation of the device

[0010] At present, most domestic manufacturers engaged in evaporation and crystallization of concentrated brine fail to control the crystal formation speed and concentration in the system, causing the crystals to precipitate and deposit in the heating tube of the heater and the crystal separator, and eventually block the heat exchange tubes and pipelines of the heat exchanger , but cannot run continuously and stably

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